Unnecessary stuff in animation
Those objects are labeled in a way that suggests they are shape widgets for the bones. Without these, the bones will look like the normal octahedral shapes (or however your armature is displayed). You could delete them if you really wanted to, but it's easier for those working on the file if you don't, especially us animators. It's very easy to get lost in a complex rig. 

I would just parent them under an empty to clean up the outliner, if that's what you're really after. 

The only parts I would delete are the lights, because those should be done in a separate file after animation is complete.